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Consider the following statements: 1. If more water is added to concrete for increasing its workability, it results into concrete of low strength. 2. No slump is an indication of a good workable concrete. 3. Higher the slump of concrete, lower will be its workability. 4. Workability of concrete is affected by water content as well as water-cement ratio. Which of the above statements are correct?

Consider the following statements: 1. If more water is added to concrete for increasing its workability, it results into concrete of low strength. 2. No slump is an indication of a good workable concrete. 3. Higher the slump of concrete, lower will be its workability. 4. Workability of concrete is affected by water content as well as water-cement ratio. Which of the above statements are correct? Correct Answer 1 and 4 only

Statement I- True

Water Cement ratio (W/C) is the ratio of weight of water to weight of cement in a concrete mix. This ratio decides the strength and workability of concrete.  According to Abram’s law, the strength of a concrete mix is inversely related to the weight ratio of water to cement. Lower W/C ratio, higher the strength but lower is the workability.

Statement II & III- False

When a standard seized mould filled completely with concrete, it is lifted in vertically upward direction that causes the concrete to subsidise and this subsidence is referred as slump value and it is further used to indicate the workability of concrete. 

Higher Subsidence ⇒ Higher the Slump value ⇒  Higher will be workability

Statement-IV – True

Factors affecting the workability of Concrete are:

1.  Water Content

2. Water –Cement Ratio

3. Size of Aggregates

4. Admixtures

5. Texture

6. Grading of Aggregates

7. Cement –aggregate ratio

Related Questions

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